Add hooks for mapping DSO library names.

gdb/solib-svr4.h

Index: gdb/solib-svr4.h
diff --git a/gdb/solib-svr4.h b/gdb/solib-svr4.h
index f9a02c9b50ac8486470a6d32bed613e9547b3967..e90a24d1d39a87e550f8ff97e390581f02c0c6fa 100644
--- a/gdb/solib-svr4.h
+++ b/gdb/solib-svr4.h
@@ -71,6 +71,9 @@ struct link_map_offsets
 extern void set_solib_svr4_fetch_link_map_offsets
   (struct gdbarch *gdbarch, struct link_map_offsets *(*func) (void));
 
+extern void set_solib_svr4_map_so_name
+  (struct gdbarch *gdbarch, const char *(*map_so_name) (char*));
+
 /* This function is called by thread_db.c.  Return the address of the
    link map for the given objfile.  */
 extern CORE_ADDR svr4_fetch_objfile_link_map (struct objfile *objfile);